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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

1H, 13C and 195Pt n.m.r. spectra of Trimethylplatinum(IV) Tetramers [PtMe3Z]4: effects of Pt-Z-Pt and long-range Pt-Z-Pt-C couplings

TG Appleton and JR Hall

Australian Journal of Chemistry 33(11) 2387 - 2403
Published: 1980

Abstract

1H, 13C and 195Pt n.m.r. spectra have been obtained for [PtMe33-Z)]4 (Z = Cl, Br, I, OH, N3, SMe, SPh, and SCF3). The compounds with Z = SPh and SCF3 have not previously been prepared. In those tetramers which contain more than one 195Pt nucleus, and where 195Pt-Z-195Pt coupling is significant, 1H and 13C spectra cannot be interpreted as first order. Values of 2JPt-Z-Pt have been calculated from 13C spectra where Z = SMe, SPh, OH, and N3, and upper limits estimated for a number of other Z. When Z = SMe and OH, long-range 195Pt-Z-Pt-13C coupling is resolved. 2J(195Pt-S-13C) when Z = SMe and SCF3, and 3J(195Pt-S-C-19F) when Z = SCF3, are unexpectedly small. The 195Pt resonance frequency decreases in the order Z = OH > SPh > SMe > N3 ≈ Cl > Br ≈ SCF3 > I. To assist in analysing the spectra transition frequencies and intensities have been calculated for the AA'2X spectrum (available as an accessory publication).

https://doi.org/10.1071/CH9802387

© CSIRO 1980

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